rolf.....If you do very tight wraps of the wire (where the wraps of coil are almost touching each other), the coil becomes self cleaning in a sense. Also the smaller the diameter of the wick the cleaner the wick and the coil stay. Also you get more flavor with tighter wraps and thinner wicks. But you have to be careful to make the coil the appropriate ohms since thinner wicks with tight wraps vape much hotter....for example with 2.4mm wicks I make 5-6 wrap coils that are 0.8-1ohms with 28g kanthal wire. With a 2mm wick I make my coils 9 wraps at 1.3 ohms. But the 1.3ohm coil vapes hotter because of less heat sink efffect due to the thinner wick.